var WINDOW_WIDTH;
var WINDOW_HEIGHT;
var RADIUS;
var MARGIN_TOP;
var MARGIN_LEFT;
var curShowTimeSeconds = 0
var balls = [];
const colors = ["#33B5E5","#0099CC","#AA66CC","#9933CC","#99CC00","#669900","#FFBB33","#FF8800","#FF4444","#CC0000"];

window.onload = function(){
	WINDOW_HEIGHT = Math.round((document.documentElement.clientHeight || document.body.clientHeight) * 2 / 3);
	WINDOW_WIDTH = document.body.clientWidth || document.documentElement.clientWidth ;
	console.log(WINDOW_HEIGHT);
	MARGIN_LEFT = Math.round(WINDOW_WIDTH / 10);
	RADIUS = Math.round(WINDOW_WIDTH * 4 / 5 / 108) - 1;
	
	MARGIN_TOP = Math.round(WINDOW_HEIGHT / 5);
	var canvas = document.getElementById('canvas'); 
	canvas.width = WINDOW_WIDTH;
	canvas.height = WINDOW_HEIGHT;
	var context = canvas.getContext('2d');
	
	curShowTimeSeconds = getCurrentShowTimeSeconds()
	setInterval(function(){
		render(context);
		update();
	}, 50);
}

function getCurrentShowTimeSeconds() {
    var curTime = new Date();
    var ret = curTime.getHours() * 3600 + curTime.getMinutes() * 60 + curTime.getSeconds();
    return ret;
}

function update(){
	var nextShowTimeSeconds = getCurrentShowTimeSeconds();

    var nextHours = parseInt( nextShowTimeSeconds / 3600);
    var nextMinutes = parseInt( (nextShowTimeSeconds - nextHours * 3600)/60 )
    var nextSeconds = nextShowTimeSeconds % 60

    var curHours = parseInt( curShowTimeSeconds / 3600);
    var curMinutes = parseInt( (curShowTimeSeconds - curHours * 3600)/60 )
    var curSeconds = curShowTimeSeconds % 60
	if( nextSeconds != curSeconds ){
        if( parseInt(curHours/10) != parseInt(nextHours/10) ){
            addBalls( MARGIN_LEFT + 0 , MARGIN_TOP , parseInt(curHours/10) );
        }
        if( parseInt(curHours%10) != parseInt(nextHours%10) ){
            addBalls( MARGIN_LEFT + 15*(RADIUS+1) , MARGIN_TOP , parseInt(curHours/10) );
        }

        if( parseInt(curMinutes/10) != parseInt(nextMinutes/10) ){
            addBalls( MARGIN_LEFT + 39*(RADIUS+1) , MARGIN_TOP , parseInt(curMinutes/10) );
        }
        if( parseInt(curMinutes%10) != parseInt(nextMinutes%10) ){
            addBalls( MARGIN_LEFT + 54*(RADIUS+1) , MARGIN_TOP , parseInt(curMinutes%10) );
        }

        if( parseInt(curSeconds/10) != parseInt(nextSeconds/10) ){
            addBalls( MARGIN_LEFT + 78*(RADIUS+1) , MARGIN_TOP , parseInt(curSeconds/10) );
        }
        if( parseInt(curSeconds%10) != parseInt(nextSeconds%10) ){
            addBalls( MARGIN_LEFT + 93*(RADIUS+1) , MARGIN_TOP , parseInt(nextSeconds%10) );
        }
     }      
        curShowTimeSeconds = nextShowTimeSeconds;
		updateBalls();
}	

function updateBalls(){
	for(var i = 0; i < balls.length; i++){
		balls[i].x += balls[i].vx;
		balls[i].y += balls[i].vy;
		balls[i].vy += balls[i].g;
		
		if(balls[i].y >= WINDOW_HEIGHT - RADIUS){
			balls[i].y = WINDOW_HEIGHT - RADIUS;
			balls[i].vy = -balls[i].vy * 0.75;
		}
	}
	var count = 0;
	for(var i = 0; i < balls.length; i++){
		if((balls[i].x + RADIUS > 0) && (balls[i].x - RADIUS < WINDOW_WIDTH)){
			balls[count++] = balls[i];
		}
	}
	while(balls.length > Math.min(count, 260)){
		balls.pop();
	}
}
	
function addBalls(x, y, num){
	for(var i = 0; i < digit[num].length; i++){
		for(var j = 0; j < digit[num][i].length; j++){
			if(digit[num][i][j] == 1){
				var aBall = {
					x: x+j*2*(RADIUS+1)+(RADIUS+1),
					y:y+i*2*(RADIUS+1)+(RADIUS+1),
					g:1.5+Math.random(),
					vx:Math.pow( -1 , Math.ceil( Math.random()*1000 ) ) * 4,
					vy:-5,
					color:colors[Math.floor(Math.random()*colors.length)]
				}
				balls.push(aBall);
			}
		}
	}
}

function render(context){	
	context.clearRect(0, 0, WINDOW_WIDTH,  WINDOW_HEIGHT);
	var hours = parseInt( curShowTimeSeconds / 3600);
    var minutes = parseInt( (curShowTimeSeconds - hours * 3600)/60 )
    var seconds = curShowTimeSeconds % 60
	renderDigit(MARGIN_LEFT,  MARGIN_TOP, parseInt(hours / 10), context);
	renderDigit(MARGIN_LEFT + 15 * (RADIUS + 1),  MARGIN_TOP, parseInt(hours % 10), context);
	renderDigit(MARGIN_LEFT + 30 * (RADIUS + 1),  MARGIN_TOP, 10, context);
	renderDigit(MARGIN_LEFT + 39 * (RADIUS + 1),  MARGIN_TOP, parseInt(minutes / 10), context);
	renderDigit(MARGIN_LEFT + 54 * (RADIUS + 1),  MARGIN_TOP, parseInt(minutes % 10), context);
	renderDigit(MARGIN_LEFT + 69 * (RADIUS + 1),  MARGIN_TOP, 10, context);
	renderDigit(MARGIN_LEFT + 78 * (RADIUS + 1),  MARGIN_TOP, parseInt(seconds / 10), context);
	renderDigit(MARGIN_LEFT + 93 * (RADIUS + 1),  MARGIN_TOP, parseInt(seconds % 10), context);
	
	for(var i = 0; i < balls.length; i++){
		 context.fillStyle=balls[i].color;
		 context.beginPath();
		 context.arc(balls[i].x, balls[i].y, RADIUS, 0, 2*Math.PI, true);
		 context.fill();
	}
}

function renderDigit(x, y, num, ctx){
	ctx.fillStyle = "rgb(0, 102, 153)";	
	for(var i = 0; i < digit[num].length; i++){
		for(var j = 0; j < digit[num][i].length; j++){
			if(digit[num][i][j] == 1){
				ctx.beginPath();
				ctx.arc(x+j*2*(RADIUS+1)+(RADIUS+1), y+i*2*(RADIUS+1)+(RADIUS+1), RADIUS,0 ,2*Math.PI);
				ctx.closePath();
				ctx.fill();
			}
		}
	}
}